Nepean Bay Weather Forecast

    • 4
    • 17

    Partly cloudy

    • 9
    • 18

    Showers increasing

    • 8
    • 17

    Showers easing

    • 5
    • 18

    Shower or two

    • 5
    • 17

    Possible shower

    • 5
    • 17

    Partly cloudy

    • 5
    • 16

    Partly cloudy

Today 17 Aug Kangaroo Island

Partly cloudy. Slight chance of a shower, most likely at night. Winds easterly 15 to 20 km/h turning northeasterly 15 to 25 km/h in the late morning and afternoon. Daytime maximum temperatures around 17.

Investigator Strait Coastal Waters

Wind
Easterly 15 to 20 knots turning northeasterly in the evening.
Seas
Around 1 metre.
1st Swell
West to southwesterly around 1 metre, increasing to 1 to 1.5 metres during the afternoon.
Weather
Partly cloudy.
Weather Situation
A high pressure system southeast of the state slowly drifts further to the southeast over Tasmania today and is forecast to be located in the Tasman Sea this afternoon, while extending a ridge over much of South Australia through to Tuesday. A trough of low pressure moves into far southwestern parts later on Tuesday and moves southeast across the state into Wednesday.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Nepean Bay Temperature Statistics View More

August Temperature

Kingscote Airport (7km)

  • Lowest 1 August, 2026

    -0.1 °C

  • Average August

    11.3 °C

  • Highest 13 August, 2026

    18.1 °C

Climate (2021–2026)

Kingscote Airport (7km)

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  • Average Low 2021–2026

    9.3 °C

  • Average 2021–2026

    14.8 °C

  • Average High 2021–2026

    21.1 °C
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